USB hub



FIG. 1 is a front and top perspective view of a USB hub, showing my new design;

FIG. 2 is a back and bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the figures illustrate portions of the USB hub that form no part of the claimed design. 

CLAIM The ornamental design for a USB hub, as shown and described. 